Remo M6R715S4SD009-U R-Series Skyndeep Bongo Drumhead - Black Calfskin Graphic, 7.15" Warm tones with increases sound, volume, and projection Skyndeep graphic, weather resistant film R-Series Bongo drumheads fit more regular full size model bongo drums from most of the major manufacturers Available in sizes: 7.15", 8.50", 8.80", 9".